A5 wont turn on - broken lcd

Hello,

I am repairing one Samsung galaxy A5. I removed the old lcd and plugged the new one, but the phone is not turning on. The phone is on the charger, I can feel that it gets a little hotter but no other thing is happening.

I also connected it to the computer, but nothing happen on the pc.

Tried to hold power button adn down volume for 10 seconds, but nothing happened

I tried to disconnect the battery and put it back(the flex), but nothing changed. No, when i got the phone it has a small brake on the lcd but it wasnt working. The phone doesnt have any bigger damage on the hosuing, so its strange that it could broke the motherboard.

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